Skip to content

Latest commit

 

History

History
36 lines (28 loc) · 1.55 KB

Exercise2.2.md

File metadata and controls

36 lines (28 loc) · 1.55 KB

Exercise 2.2 - Basics

If you do not finish during the lecture period, please finish it as homework.

Book Index (Working with maps, arrays and slices)

A Book Index is an inverted index which lists all pages a word occurs in a book. Write a program which generates an inverted index out of an array of book pages. Each Page contains an array of words.

  • Use the "type" keyword to define custom types for Book, Page and Index.
  • Write a unit test which generates a book and calculates the index and prints it to Stdout

After this Exercise

  • You know the basic Go container types: string, map, array, slice
  • You know how to make custom types printable

Usage of the Library functions and error handling

Write a program "find" that searches the filesystem recursively from a given path and regex expression.

  1. Use the flag library (https://tour.golang.org/methods/17) to provide the following parameters
   Usage of find:
   -path string
       path to search (default ".")
   -regex string
       path (default ".*")
  1. Use the ioutil.ReadDir (https://pkg.go.dev/io/ioutil@go1.17.2#ReadDir) function to list the contents of a given directory. Check each file for the given regex with the "regexp.MatchString" (https://pkg.go.dev/regexp#MatchString) function and print its path+name on the screen.
  2. Either use "panic" or "log.Fatal" for error handling.
  3. Run through directories recursively

Question

Go doesn't support Exceptions but uses multiple return values of which one can be the error information. Discuss the pro and cons about both approaches.